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Ethylene-based polymer resin

a polymer resin and ethylene-based technology, applied in the field of ethylene-based polymer resins, can solve the problems of high speed moldability, low impact strength, and difficult high speed hauling off, and achieve the effect of excellent balance of extrusion moldability, mechanical strength and appearan

Inactive Publication Date: 2005-03-15
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

An object of the present invention is to provide an ethylene-based polymer resin excellent in balance of extrusion moldability, mechanical strength and appearance of extruded molded article.

Problems solved by technology

A low density polyethylene obtained by a high pressure radical polymerization method has defects that molding at high speed is difficult because of too high melt tension though balance between extrusion torque and melt tension is excellent, further, that impact strength is low.
On the other hand, regarding a conventional linear low density polyethylene using an α-olefin such as 1-butene or 1-hexene as a copolymerization component with ethylene, methods of increasing molecular weight and decreasing density for improving mechanical strength and methods of increasing molecular weight for improving melt tension, are envisaged, however, these are not suitable methods since deterioration in moldability due to increase in extrusion torque during molding and deterioration in rigidity and heat resistance, is invited.
JP-A-04-213309 discloses a polyethylene copolymer having an extremely high melt tension, however, it has defects that high speed hauling off is difficult due to too high melt tension and consequently molding speed is restricted, therefore, it can not be said that requirements are satisfied.
JP-A-06-9724 discloses an ethylene copolymer having relatively low melt tension, however, it has a narrow molecular weight distribution and its flowability is not admitted as sufficiently excellent, and also in relation between melt index and intrinsic viscosity, it is rather nearer to conventional linear low density polyethylenes than high pressure processed low density polyethylenes excellent in processability, not sufficiently satisfying conventional requirements in moldability.
Therefore, it is extremely difficult to enable even molding at high speed with improving mechanical strength and melt tension while suppressing increase in extrusion torque during molding and decrease in rigidity, and development of such resins is strongly desired.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Catalyst Component

Into a 5 liter four-necked flask purged with nitrogen was charged 1.5 liter of tetrahydrofuran and 1.35 liter (2.7 mol) of a hexane solution of diethylzinc (2 mol / liter) and the mixture was cooled to 5° C. A solution prepared by dissolving 0.2 kg (1 mol) of pentafluorophenol in 500 ml of tetrahydrofuran was added drop wise to this over 60 minutes. After completion of dropping, the mixture was stirred at 5° C. for 60 minutes, and the temperature was raised to 45° C. over 28 minutes, and stirring thereof was conducted for 60 minutes. Then, the temperature was lowered to 20° C. with an ice bath, and 45 g (2.5 mol) of water was dropped over 90 minutes. Then, the mixture was stirred at 20° C. for 60 minutes, and the temperature was raised to 45° C. over 24 minutes, and stirring thereof was carried out for 60 minutes. Then, the solvent was distilled under reduced pressure for 120 minutes while raising temperature from 20° C. to 50° C., thereafter, drying u...

example 2

An ethylene / 1-hexene copolymer was obtained in the same manner as in Example 1 except that a pre-polymerized catalyst component in which polyethylene had been pre-polymerized at a proportion of 48.2 g per 1 g of the co-catalyst carrier (A) was-used, the gas linear velocity was changed to 0.34 m / sec, the molar ratio of hydrogen to ethylene was changed to 0.10%, the molar ratio of 1-hexene to ethylene was changed to 1.9%, the feeding rate of the above-mentioned previously polymerized catalyst component was changed to 0.12 kg / hr, and the feeding rate of triisobutylaluminum was changed to 27 mmol / hr. The resulted ethylene-based polymer resin showed physical properties as shown in Table 1.

example 3

Preparation of Catalyst Component

(1) Treatment of Silica

Into a 3 liter four-necked flask purged with nitrogen was charged 0.2 kg of silica (Sylopol 948 manufactured by Davison Co., Ltd. which had been heat-treated at 300° C. under nitrogen flow next, 1.2 liters of toluene was charged therein while washing silica attached to an inner wall of the flask. After cooled to 5° C., a mixed solution of 84.4 ml of 1,1,1,3,3,3-hexamethyldisilazane and 115 ml of toluene was added dropwise thereto over 25 minutes. After completion of dropping, the resulting mixture was stirred at 5° C. for 1 hr, and additional at 95° C. for 3 hrs, and filtered to obtain a solid. Thereafter, 1.2 liters of toluene was added, then allowed to stand over night to prepare a slurry.

(2) Synthesis of Co-catalyst Carrier (A′)

0.55 Liter (1.10 mol) of a hexane solution of diethylzinc (2.00 mol / liter) was added to the slurry obtained in the above (1), and the mixture was cooled to 5° C. A solution prepared by dissolving 105 ...

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Abstract

An ethylene-based polymer resin which is obtained by copolymerizing ethylene with an α-olefin having 5 to 20 carbon atoms, and has a melt flow rate (MFR) measured at 190° C. under a load of 21.18 N according to JIS K7210-1995, of not less than 0.01 g / 10 min. and less than 1 g / 10 min., wherein the melt flow rate and a melt tension(MT) at 190° C. (unit: cN) of the resin satisfy a relation of the following expression (1) and an intrinsic viscosity [η] (unit: dL / g) and the melt flow rate of the resin satisfy a relation of the following expression (2):2×MFR−0.59<MT<3.6×MFR−0.66  (1)1.02×MFR−0.094<[η]<1.50×MFR−0.156  (2).

Description

BACKGROUND OF THE INVENTION1. Field of the InventionThe present invention relates to an ethylene-based polymer resin excellent in balance of extrusion moldability, mechanical strength and appearance of extruded molded article.2. Description of Related ArtEthylene-based polymer resins have been used in a variety of fields as a general purpose type resin, and are required to have mechanical properties such as, for example, impact strength, appearance of extruded articles such as film and sheet, such as surface smoothness, gloss and transparency, in addition to extrusion moldability such as, for example, extrusion torque, melt tension and high speed processability. A low density polyethylene obtained by a high pressure radical polymerization method has defects that molding at high speed is difficult because of too high melt tension though balance between extrusion torque and melt tension is excellent, further, that impact strength is low. On the other hand, regarding a conventional lin...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C08F210/00C08F210/16C08F110/02C08F4/659C08F110/00C08F4/00C08F4/6592
CPCC08F210/16C08F4/65908C08F4/65916C08F4/65927C08F110/02C08F2500/12C08F2500/17C08F2500/11C08F2500/20C08F2500/04C08F2500/19C08F210/14C08F2500/14
Inventor ISEKI, YUKI
Owner SUMITOMO CHEM CO LTD
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